In a word... No.
If you are not using all of your ram (no game I've played uses anywhere near 16GB) then adding more will have no effect. Better ram frequency and latency technically will help certain things run faster, but I would expect to see 0-2fps difference in games.
I see you are running SLI 670s, so upgrading to 680s is a lot of expense for a tiny upgrade. Your best option for more FPS is to overclock your video cards.
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